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Microsoft Teams: We can't connect you: Error HTTP 400
I can't connect to Microsoft Teams using my second account! I have a Primary account which I use for one business, but also I have a second account, which can't Microsoft Teams: We can't connect...
I had the same issue on my mobile phone. I solved it by going into settings -> accounts. There I went to my accounts and deleted the one I could not log into to make the phone forget about it.
That solved it for me in my case, so the problem is not inside Teams, but somewhere inside your device I assume.
That solved it for me in my case, so the problem is not inside Teams, but somewhere inside your device I assume.